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        1. Ӣҽ̾W(wng) > > }ĿԔ
          ؊W\(yn)(hu)gһNh(hun)τ(dng)܇ڸ(chng)^֮gτ(dng)܇(dng)r(sh)(ni)ȼC(j)늳ͨ^ijNʽ܇݆ݔ(dng)Ҫ늳؃(ch)^͕r(sh)(ni)ȼC(j)(dng)ȿ܇݆ݔҲͬr(sh)o늳س(dng)܇vҪȫٕr(sh)(ni)ȼC(j)늳߀ͬr(sh)܇݆ݔ
          һy(c)ԇˆT{ԓ܇ƽֱ·τ0.5h^xPl(f)F(xin)@Εr(sh)g(ni)܇(ni)ȼC(j)ȼ 4.475kg܇ٞ50km/h늳ؽM(ch)ֵ60%ӵ80%늳ؽM(ch)ֵ1.08×108J܇ʹüg(sh)փ(c)y(c)ԇˆTl(f)F(xin)ԓ܇ʹõȼ͵ğֵ4.0×107J/kg܇r(sh)f܇vP(gun)ϵDʾ
          1τ(dng)܇(dng)r(sh)늳ص______D(zhun)܇______ܣ
          2(j)Dԓ܇ڜy(c)ԇ^ܵ
          3ԓ܇ڜy(c)ԇ^Ѓ(ni)ȼC(j)ĠǶǶ󣿣Y(ji)ȡ(sh)
          4ԇӋ(j)ԓ܇(ni)ȼC(j)ЧʣӋ(j)(ni)ȼC(j)C(j)е(dng)^еpʧ

          𰸡1τ(dng)܇(dng)r(sh)늳صĻW(xu)D(zhun)C(j)еܣ
          2ɈD܇ٶȞ50km/hr(sh)܇ܵ
          3܇\(yn)(dng)̎ƽB(ti)ƽl܇Ġ
          ٶȹʽ׃ιʽ܇ľx(j)ʽW=FsĹȻ܇Ĺ
          4֪ȼ͵|(zh)4.475kgȼ͵ğֵ4.0×107J/kg(j)Q=mqȼͷųğ֪늳ؽM(ch)ֵ60%ӵ80%D(zhun)ɵ@ӱЧõĹD(zhun)ɵ֮(j)Чʹʽ(ni)ȼC(j)Чʣ
          ⣺1τ(dng)܇(dng)r(sh)늳ذу(ch)ĻW(xu)D(zhun)܇C(j)е
          2ɈD֪(dng)܇ٶȞ50km/hr(sh)܇ܵ2000N
          3܇\(yn)(dng)ƽlã
          ܇F=f=2000N
          v=
          ܇ͨ^·̣
          s=vt=50km/h×0.5h=25km=25000m
          Ĺ
          W1=Fs=2000N×25000m=5×107J
          ĹP==27778W
          4D(zhun)ɵܣ
          W2=1.08×108J×80%-60%=2.16×107J
          ԣW=W1+W2=5×107J+2.16×107J=7.16×107J
          ȼͷųğ
          Q=mq=4.475kg×4.0×107J/kg=1.79×108J
          W=Q=1.79×108J
          (ni)ȼC(j)Чʣ
          =×100%=×100%=40%
          𣺣1τ(dng)܇(dng)r(sh)늳صĻW(xu)D(zhun)܇C(j)еܣ
          2ԓ܇ڜy(c)ԇ^ܵ2000N
          3ԓ܇ڜy(c)ԇ^Ѓ(ni)ȼC(j)ĠǞ5×107J27778W
          4ԓ܇(ni)ȼC(j)Чʞ40%
          c(din)u(png)}CϿ˟Ӌ(j)ԼC(j)ЧҲһе}䌍(sh)Ãr(ji)ֵ(du)ʽİպ\(yn)ǻA(ch)ֻҪx}wf}yȲӋ(j)(ni)ȼC(j)Чʕr(sh)ҪעⲻҪӛD(zhun)ɵܵ
          (x)(c)ϵд
          P(gun)(x)}

          Ŀ Դ

          ؊W\(yn)(hu)gһNh(hun)τ(dng)܇ڸ(chng)^֮gτ(dng)܇(dng)r(sh)(ni)ȼC(j)늳ͨ^ijNʽ܇݆ݔ(dng)Ҫ늳؃(ch)^͕r(sh)(ni)ȼC(j)(dng)ȿ܇݆ݔҲͬr(sh)o늳س늣(dng)܇vҪȫٕr(sh)(ni)ȼC(j)늳߀ͬr(sh)܇݆ݔ
          һy(c)ԇˆT{ԓ܇ƽֱ·τ0.5h^xPl(f)F(xin)@Εr(sh)g(ni)܇(ni)ȼC(j)ȼ 4.475kg܇ٞ50km/h늳ؽM(ch)ֵ60%ӵ80%늳ؽM(ch)ֵ1.08108J܇ʹüg(sh)փ(c)y(c)ԇˆTl(f)F(xin)ԓ܇ʹõȼ͵ğֵ4.0107J/kg܇r(sh)f܇vP(gun)ϵDʾ
          1τ(dng)܇(dng)r(sh)늳ص
          W(xu)
          W(xu)
          D(zhun)܇
          C(j)е
          C(j)е
          ܣ
          2(j)Dԓ܇ڜy(c)ԇ^ܵ
          3ԓ܇ڜy(c)ԇ^Ѓ(ni)ȼC(j)ĠǶǶY(ji)ȡ(sh)
          4ԇӋ(j)ԓ܇(ni)ȼC(j)ЧʣӋ(j)(ni)ȼC(j)C(j)е(dng)^еpʧ

          鿴𰸺ͽ>>

          Ŀ Դ

          ڂ؊W\(yn)(hu)gl(f)һNo(j)ţ|(zh)16.1g˜y(c)weһ(g)bMˮͲy(c)ˮ|(zh)1.810-3 kgՈ(qng)ͨ^Ӌ(j)beo(j)ŵĽٿʲô

          鿴𰸺ͽ>>

          Ŀ Դ

          Ӣҽ̾W(wng)؊W\(yn)(hu)gһNh(hun)τ(dng)܇ڸ(chng)^֮gτ(dng)܇(dng)r(sh)(ni)ȼC(j)늳ͨ^ijNʽ܇݆ݔ(dng)Ҫ늳؃(ch)^͕r(sh)(ni)ȼC(j)(dng)ȿ܇݆ݔҲͬr(sh)o늳س(dng)܇vҪȫٕr(sh)(ni)ȼC(j)늳߀ͬr(sh)܇݆ݔһy(c)ԇˆT{ԓ܇ƽֱ·τ0.5h^xPl(f)F(xin)@Εr(sh)g(ni)܇(ni)ȼC(j)ȼ 4.475kg܇ٞ50km/h늳ؽM(ch)ֵ60%ӵ80%늳ؽM(ch)ֵ1.08108J܇ʹüg(sh)փ(c)y(c)ԇˆTl(f)F(xin)ԓ܇ʹõȼ͵ğֵ4.0107J/kg܇r(sh)f܇vP(gun)ϵDʾ
          1τ(dng)܇(dng)r(sh)늳
           
          D(zhun)܇
           
          ܣ
          2ԓ܇ڜy(c)ԇ^Ѓ(ni)ȼC(j)ĠǶ
          3ԓ܇ڜy(c)ԇ^늳ؽM(ch)˶
          4ԇӋ(j)ԓ܇(ni)ȼC(j)ЧʣӋ(j)(ni)ȼC(j)C(j)е(dng)^еpʧ

          鿴𰸺ͽ>>

          Ŀ Դ }

          ؊W\(yn)(hu)gһNh(hun)τ(dng)܇ڸ(chng)^֮gτ(dng)܇(dng)r(sh)(ni)ȼC(j)늳ͨ^ijNʽ܇݆ݔ(dng)Ҫ늳؃(ch)^͕r(sh)(ni)ȼC(j)(dng)ȿ܇݆ݔҲͬr(sh)o늳س늣(dng)܇vҪȫٕr(sh)(ni)ȼC(j)늳߀ͬr(sh)܇݆ݔ
          һy(c)ԇˆT{ԓ܇ƽֱ·τ0.5h^xPl(f)F(xin)@Εr(sh)g(ni)܇(ni)ȼC(j)ȼ 4.475kg܇ٞ50km/h늳ؽM(ch)ֵ60%ӵ80%늳ؽM(ch)ֵ1.08108J܇ʹüg(sh)փ(c)y(c)ԇˆTl(f)F(xin)ԓ܇ʹõȼ͵ğֵ4.0107J/kg܇r(sh)f܇vP(gun)ϵDʾ
          1τ(dng)܇(dng)r(sh)늳ص______D(zhun)܇______ܣ
          2(j)Dԓ܇ڜy(c)ԇ^ܵ
          3ԓ܇ڜy(c)ԇ^Ѓ(ni)ȼC(j)ĠǶǶ󣿣Y(ji)ȡ(sh)
          4ԇӋ(j)ԓ܇(ni)ȼC(j)ЧʣӋ(j)(ni)ȼC(j)C(j)е(dng)^еpʧ

          鿴𰸺ͽ>>

          ͬ(x)(c)